Module: Parallel Processing
(c) 2001 by O.Conrad
Menu: Terrain Analysis > Hydrology > Catchment Area
Description
Parallel processing of cells for calculation of flow accumulation and related parameters. This set of algorithms processes a DEM downwards from the highest to the lowest cell.

References:

Deterministic 8
- O'Callaghan, J.F. / Mark, D.M. (1984):
'The extraction of drainage networks from digital elevation data',
Computer Vision, Graphics and Image Processing, 28:323-344

Rho 8:
- Fairfield, J. / Leymarie, P. (1991):
'Drainage networks from grid digital elevation models',
Water Resources Research, 27:709-717

Braunschweiger Reliefmodell:
- Bauer, J. / Rohdenburg, H. / Bork, H.-R. (1985):
'Ein Digitales Reliefmodell als Vorraussetzung fuer ein deterministisches Modell der Wasser- und Stoff-Fluesse',
Landschaftsgenese und Landschaftsoekologie, H.10, Parameteraufbereitung fuer deterministische Gebiets-Wassermodelle,
Grundlagenarbeiten zu Analyse von Agrar-Oekosystemen, (Eds.: Bork, H.-R. / Rohdenburg, H.), p.1-15

Deterministic Infinity:
- Tarboton, D.G. (1997):
'A new method for the determination of flow directions and upslope areas in grid digital elevation models',
Water Ressources Research, Vol.33, No.2, p.309-319

Multiple Flow Direction:
- Freeman, G.T. (1991):
'Calculating catchment area with divergent flow based on a regular grid',
Computers and Geosciences, 17:413-22

- Quinn, P.F. / Beven, K.J. / Chevallier, P. / Planchon, O. (1991):
'The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models',
Hydrological Processes, 5:59-79

Triangular Multiple Flow Direction
- Seibert, J. / McGlynn, B. (2007):
'A new triangular multiple flow direction algorithm for computing upslope areas from gridded digital elevation models',
Water Ressources Research, Vol. 43, W04501
C++ Implementation into SAGA by Thomas Grabs, Copyrights (c) 2007
Contact: thomas.grabs@natgeo.su.se, jan.seibert@natgeo.su.se


Parameters
NameTypeIdentifierDescriptionConstraints
Input
Elevation Grid (input)ELEVATION
Sink Routes (*)Grid (optional input)SINKROUTE
Weight (*)Grid (optional input)WEIGHT
Output
Catchment AreaGrid (output)CAREA
Catchment Height (*)Grid (optional output)CHEIGHT
Catchment Slope (*)Grid (optional output)CSLOPE
Catchment Aspect (*)Grid (optional output)CASPECT
Flow Path Length (*)Grid (optional output)FLWPATH
Options
StepIntegerSTEPMinimum: 1.000000
MethodChoiceMethodAvailable Choices:
[0] Deterministic 8
[1] Rho 8
[2] Braunschweiger Reliefmodell
[3] Deterministic Infinity
[4] Multiple Flow Direction
[5] Multiple Triangular Flow Directon
Linear FlowBooleanDOLINEARUse D8 if catchment area becomes higher than specified threshold.
Linear Flow ThresholdFloating pointLINEARTHRSUse D8 if catchment area becomes higher than specified threshold (Cells).
ConvergenceFloating pointCONVERGENCEConvergence factor for Multiple Flow Direction Algorithm after Freeman (1991) and Multiple Triangular Flow Directon Algorithm after Seibert/Glynn (2007).Minimum: 0.000000
(*) optional